Error 0x880003EF

Value: -2013264913 | 0x880003EF | 2281702383

What does it mean ?

hrDatabaseAttached  
The database is already attached.
Value: 1007 | 0x03EF | 0b0000001111101111

Where does it come from ?

FACILITY_NTDSB  
Active Directory Domain Services
Value: 2048 | 0x800 | 0b100000000000

Other Errors for FACILITY_NTDSB